Temperature sensor

Abstract

The invention provides a temperature sensor, which comprises a first shell comprising an upper end part, a middle end part and a lower end part, a first groove is arranged between the upper end part and the middle end part, the middle end part is provided with a second groove, and the lower end part is provided with a first bending part; a terminal embedded and fixed inside the first housing; a temperature sensing element electrically connected to the terminal; the corrosion-resistant shell comprises a second bending part and a third bending part, and the shape of the second bending part is matched with that of the first bending part; the first sealing ring is arranged at the second groove; the second sealing ring is arranged on the outer side of the third bending part; and the second shell comprises an elastic extension part and a boss, the elastic extension part elastically covers the second groove, and the boss and the third bending part clamp the second sealing ring. The temperature sensor can accurately detect the temperature of the corrosive fluid, can prevent the corrosive fluid from leaking, and guarantees the reliability and service life of the temperature sensor.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and more specifically, to a temperature sensor. Background Technology

[0002] Currently, temperature sensors are widely used in automotive air conditioning systems. Installed at the outlet of the expansion valve, in contact with corrosive fluids, they detect the temperature of these fluids and transmit the signal to the air conditioning control system. This control then regulates the flow rate of the corrosive fluid through the expansion valve, ensuring efficient air conditioning operation. However, corrosive fluids are highly corrosive and easily damage the temperature sensor housing, affecting its lifespan. Furthermore, in existing technologies, temperature sensors typically employ a one-piece housing design, such as a direct threaded connection between the sensor housing and the mounting base, resulting in direct thermal contact between the sensor and the mounting base. When the mounting base temperature changes due to environmental or engine heat, the thermistor is affected by external temperature interference, leading to inaccurate monitoring of the corrosive fluid temperature and consequently affecting the control accuracy of the expansion valve. This can result in poor air conditioning cooling, insufficient cooling, and unstable temperature control. In addition, existing refrigerant sensors have insufficient sealing performance, making them susceptible to moisture or dust intrusion, affecting their reliability. Therefore, there is an urgent need for a temperature sensor that can avoid external temperature interference, improve temperature measurement accuracy and sealing, and is corrosion-resistant. Summary of the Invention

[0003] In view of this, this application provides a temperature sensor, which aims to solve the technical problems of low temperature measurement accuracy, poor sealing, and susceptibility to corrosion affecting the lifespan of existing temperature sensors.

[0004] The technical solution provided in this application is as follows: This application provides a temperature sensor, the temperature sensor comprising: A first housing includes an upper end, a middle end, and a lower end. A first groove is provided between the upper end and the middle end. A second groove is provided at the middle end. A first bend is provided at the lower end. Terminals, which are embedded and fixed inside the first housing; A temperature sensing element, which is electrically connected to the terminal; A corrosion-resistant housing, the corrosion-resistant housing comprising a second bend and a third bend, the shape of the second bend matching the shape of the first bend, one end of which is inserted into the middle end, and the other end connected to the first end of the third bend; A first sealing ring is disposed at the second groove to isolate external moisture; A second sealing ring is disposed on the outside of the third bend to seal against corrosive fluids; The second housing includes an elastic extension and a boss. The elastic extension elastically covers the second groove and engages with the first groove. The boss and the third bending portion clamp the second sealing ring.

[0005] Furthermore, there is a gap between the corrosion-resistant housing and the second housing.

[0006] Furthermore, the corrosion-resistant shell also includes an extension and a fourth bend; The fourth bend is connected to the other end of the third bend via the extension, and the fourth bend covers the temperature sensing element.

[0007] Furthermore, the second housing also includes: a mounting portion; The mounting part has threads on its outer side, and the temperature sensor is mounted to an external device through the mounting part.

[0008] Furthermore, the temperature sensor also includes a third sealing ring; The third sealing ring is fitted onto the outer diameter of the mounting part near the boss.

[0009] Furthermore, the extension covers the portion of the terminal that extends out of the first housing.

[0010] Furthermore, the terminal includes a first end, a second end, and a variable diameter portion connecting the first end and the second end; The first end is embedded into the upper end of the first housing; The second end extends outward from the first housing and is electrically connected to the temperature sensing element; The variable diameter section includes a third groove near the first end and a fourth groove near the second end, and the terminal is fixedly connected to the first housing through the third groove and the fourth groove.

[0011] Furthermore, the corrosion-resistant housing is bonded and fixed to the terminal and the temperature sensing element with thermally conductive adhesive.

[0012] Furthermore, the first housing is a plastic housing.

[0013] Furthermore, the second housing is a metal housing.

[0014] The solution provided in this application has the following beneficial effects: 1. The temperature sensor provided in this application, by using a corrosion-resistant housing made of corrosion-resistant material, can effectively resist the corrosion of corrosive fluids in the temperature sensor, preventing leakage of corrosive fluids caused by damage to the housing during long-term use. In actual use, the heat generated by external devices will be conducted to the internal temperature sensing element through the second housing, which is in direct contact with the external devices. By setting the corrosion-resistant housing, the temperature sensing element is isolated from the external devices, and the heat from the external devices will not be conducted to the temperature sensing element. Without the temperature interference from external devices, the temperature sensing element can accurately monitor the temperature of the corrosive fluid.

[0015] 2. The temperature sensor provided in this application achieves a tight fit between the first housing and the corrosion-resistant housing by forming a shape-matching structure through the first bending part and the second bending part. The matching shape maximizes the contact area and reduces wear caused by micro-movement or vibration. This design is similar to a mortise and tenon structure, which can improve the rigidity of the overall structure and prevent the temperature sensor from deforming under high pressure or high temperature.

[0016] 3. The temperature sensor provided in this application, by setting a first sealing ring at the first groove, the shape of the first sealing ring matches the shape of the first groove, which can ensure that the two form a tight fit, effectively preventing external water vapor, dust and other pollutants from entering the temperature sensor and causing the temperature sensor to fail.

[0017] 4. The temperature sensor provided in this application, by setting a second sealing ring between the outer side of the third bend and the boss, and matching the shape of the second sealing ring with the degree of bending of the outer side of the third bend, increases the contact area between the second sealing ring and the outer surface of the third bend. This allows the second sealing ring to distribute a more uniform sealing pressure when compressed by the rolling process. After the second sealing ring is compressed, it can further achieve permanent sealing against corrosive fluids, preventing them from leaking to the outside of the temperature sensor.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic cross-sectional view of the temperature sensor provided in the embodiments of this application. Figure 1 This figure shows a first housing, a first groove, a terminal, a temperature sensing element, a corrosion-resistant housing, a second housing including a boss and a mounting part, a first sealing ring, and a third sealing ring; Figure 2 A schematic cross-sectional view of the temperature sensor provided in the embodiments of this application. Figure 2 This figure shows a first housing, a first groove, a temperature sensing element, a corrosion-resistant housing, a second housing including a boss and a mounting part, a first sealing ring, a second sealing ring, and a third sealing ring; Figure 3 This is a perspective view of a temperature sensor provided in an embodiment of this application. The view shows the structure of the terminal, which includes a first end, a second end, a variable diameter portion, a third groove, and a fourth groove.

[0021] Explanation of reference numerals in the attached figures: 100-First housing; 101-First groove; 200-Terminal; 201-First end; 202-Second end; 203-Reducing diameter part; 204-Third groove; 205-Fourth groove; 300-Temperature sensing element; 400-Corrosion resistant housing; 401-First sealing ring; 402-Second sealing ring; 500-Second housing; 501-Boss; 502-Mounting part; 600-Third sealing ring. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the terms "inner," "outer," "upper," "lower," "vertical," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, features in the following embodiments can be combined with each other.

[0027] In view of the shortcomings of the prior art, the technical solution of this application is proposed. The technical solution of this application will be described in detail below.

[0028] Please see Figures 1-2 , Figure 1 A schematic cross-sectional view of the temperature sensor provided in the embodiments of this application. Figure 1 , Figure 2 A schematic cross-sectional view of the temperature sensor provided in the embodiments of this application. Figure 2 The temperature sensor includes: a first housing 100, a terminal 200, a temperature sensing element 300, a corrosion-resistant housing 400, a first sealing ring 401, a second sealing ring 402, and a second housing 500.

[0029] The first housing 100 includes an upper end, a middle end, and a lower end. A first groove 101 is provided between the upper end and the middle end. A second groove is provided at the middle end, and a first bend is provided at the lower end. The first housing 100 is formed into an approximately cylindrical shape with a stepped portion, and sequentially includes the integrally formed upper end, middle end, and lower end along the axial direction. The upper end is a flat, closed end, and the diameter of the upper end is approximately the same as the diameter of the middle end, and both the diameters of the upper end and the middle end are larger than the diameter of the lower end. The first groove 101 is provided between the upper end and the middle end, and the first groove 101 is annular. The second groove is provided on the inner wall of the middle end, and the second groove is also annular. The first housing 100 is a plastic housing, selected from materials with high tensile strength and flexural strength, high rigidity, and excellent thermal properties, such as PA66+GF30.

[0030] The terminal 200 is embedded and fixed inside the first housing 100. For example, in this embodiment, two terminals 200 with identical structures are symmetrically arranged, and each of the terminals 200 partially penetrates the first housing 100 in the axial direction. The terminal 200 is made of a conductive material (e.g., metal).

[0031] The temperature sensing element 300 is electrically connected to the terminal 200. The temperature sensing element 300 is soldered and fixed to the portion of the terminal 200 that extends out of the first housing 100. The temperature sensing element 300 converts the sensed temperature into an electrical signal and outputs this signal as a temperature sensor signal. The temperature sensing element 300 can use a negative temperature coefficient thermistor or other suitable thermistors. Its leads are electrically connected to the end of the terminal 200 extending out of the first housing 100 by soldering (e.g., laser soldering or resistance soldering). After soldering, the solder joints are insulated and encapsulated with epoxy resin to ensure no bubbles or short circuit risks. The first housing 100 also includes a tip located at the lower end, positioned between two identical terminals 200, isolating the two identical terminals 200 to prevent solder bridging and short circuits during soldering. The tip also isolates the two pins of the temperature sensing element 300 to prevent contact short circuits.

[0032] The corrosion-resistant housing 400 includes a second bend and a third bend. The shape of the second bend matches the shape of the first bend, with one end inserted into the intermediate end and the other end connected to the first end of the third bend. The corrosion-resistant housing 400 is made of a corrosion-resistant material, such as stainless steel SUS316L, or other materials that can meet the 48-hour neutral salt spray requirement; this application is not limited to this. The shape of the second bend matches the shape of the first bend, having the same bending profile as the first bend to achieve a close fit between them. One end of the second bend is inserted into the intermediate end, and the other end is connected to one end of the third bend, forming a smooth transition and avoiding stress concentration. The third bend is continuously disposed with the second bend and extends along the axial direction of the corrosion-resistant housing 400.

[0033] The first sealing ring 401 is disposed at the second groove to isolate external moisture. The first sealing ring 401 is an O-ring structure, with its inner diameter slightly smaller than the bottom diameter of the second groove, and is pressed into the second groove through elastic deformation. When the first sealing ring 401 is installed, it is subjected to radial compression, forming an interference fit, making it tightly adhere to the inner wall of the second groove. The first sealing ring 401 is made of a high-performance elastomer material, such as hydrogenated nitrile butadiene rubber (HNBR). Hydrogenated nitrile butadiene rubber has excellent heat resistance, with a long-term operating temperature of -40℃ to 150℃ and short-term tolerance to high temperatures of 160℃ to 180℃, enabling it to withstand higher temperatures and improve the lifespan of the temperature sensor. The material of the first sealing ring 401 is not limited to hydrogenated nitrile butadiene rubber; it can also be other high-performance elastomer materials, which are not limited herein. The first sealing ring 401 is disposed in the second groove, that is, inside the first housing 100, which can prevent external moisture from entering the temperature sensor and causing a short circuit risk.

[0034] The second sealing ring 402 is disposed on the outside of the third bend to seal against corrosive fluid. The second sealing ring 402 is an O-ring structure, its inner diameter matching the outer diameter of the third bend, and it is fitted onto the outside of the third bend. The shape of the second sealing ring 402 matches the shape of the third bend, and the bend in the third bend increases the contact area between its outer surface and the second sealing ring 402, allowing for a more uniform distribution of sealing pressure when the second sealing ring 402 is compressed. The second sealing ring 402 seals against the internal corrosive fluid and is made of a highly corrosion-resistant material, such as hydrogenated nitrile butadiene rubber (HNBR). HNBR has a highly saturated molecular structure and exhibits excellent resistance to corrosive fluids (such as refrigerant R143a), further improving the lifespan and reliability of the temperature sensor. The material of the second sealing ring 402 is not limited to HNBR; it can also be other materials with high resistance to corrosive fluids, which is not limited herein.

[0035] The second housing 500 includes an elastic extension and a boss 501. The elastic extension elastically covers the second groove and engages with the first groove. The boss 501 clamps and fixes the second sealing ring 402 with the third bending portion. The elastic extension extends axially along the second housing 500 and its material has elastic deformation capability, allowing it to recover its original shape after temporary bending during assembly. The end of the elastic extension has a hook-shaped protrusion that engages with the edge of the first groove 101. When assembling the temperature sensor, an axial force is applied to the second housing 500, causing the elastic extension to bend and slide into the first groove 101 until the hook-shaped protrusion at the end of the elastic extension engages with the first groove 101. This engagement method provides a reversible fixation method, facilitating maintenance or replacement, while ensuring that the first sealing ring 401 is not damaged by compression. The boss 501 can be rectangular, polygonal, or other shapes, with a smooth surface to avoid damaging the second sealing ring 402. The boss 501 is aligned with the third bend of the corrosion-resistant housing 400, forming a slit or gap between the boss 501 and the third bend. This gap accommodates and holds the second sealing ring 402. During temperature sensor assembly, the second sealing ring 402 is first fitted onto the outside of the third bend. Then, the boss 501 of the second housing 500 is positioned opposite the third bend. Through axial pressure or rotation, the boss 501 and the third bend are brought closer together. A rolling process is then used to compress the second sealing ring 402, generating radial or axial compressive force to ensure uniform deformation and a tight seal. The second housing 500 is a metal housing selected from materials with strong corrosion resistance, high strength, high hardness, heat resistance, and high-temperature oxidation resistance.

[0036] In this embodiment, by using a corrosion-resistant material to prepare the corrosion-resistant housing 400, it can effectively resist the corrosive fluid in the temperature sensor, preventing leakage of the corrosive fluid caused by damage to the housing during long-term use. During actual use, heat generated by external devices is conducted to the internal temperature-sensing element 300 through the second housing 500, which is in direct contact with the external devices. By setting the corrosion-resistant housing 400, the temperature-sensing element 300 is isolated from the external devices, preventing heat from being conducted to the temperature-sensing element 300. Without temperature interference from external devices, the temperature-sensing element 300 can accurately monitor the temperature of the corrosive fluid. By forming a shape-matching structure between the first housing 100 and the corrosion-resistant housing 400 through the first and second bends, a tight fit can be achieved between them, and the matching shape maximizes the contact area, reducing wear caused by micro-movements or vibrations. This design is similar to a mortise and tenon structure, which can improve the overall structural rigidity and prevent the temperature sensor from deforming under high pressure or high temperature. Through the third bend... A second sealing ring 402 is provided between the side and the protrusion 501. The shape of the second sealing ring 402 matches the bending degree of the outer side of the third bend, increasing the contact area between the second sealing ring 402 and the outer surface of the third bend. This allows the second sealing ring 402 to distribute sealing pressure more evenly when compressed by the rolling process. After compression, the second sealing ring 402 can further achieve a permanent seal against corrosive fluids, preventing leakage to the outside of the temperature sensor. Furthermore, the third bend, through its connection with the... The protrusion 501, in conjunction with the first sealing ring 402, not only secures the second sealing ring 402 but also disperses internal stress, preventing excessive wear and breakage of the second sealing ring 402. By elastically covering the first sealing ring 401 with the elastic extension, the first sealing ring 401 is protected from mechanical wear and damage. The elastic pressure also helps the first sealing ring 401 achieve uniform compression, improving its isolation from external moisture. The elastic extension is snapped into the first groove 101 for easy disassembly and replacement.

[0037] In one embodiment, the corrosion-resistant housing 400 further includes an extension and a fourth bend; the fourth bend is connected to the other end of the third bend via the extension, and the fourth bend covers the temperature-sensing element 300. The extension covers the portion of the terminal 200 that protrudes from the first housing 100. The extension connects the third bend and the fourth bend, and the fourth bend is a smooth semi-circular structure that covers the temperature-sensing element 300. The extension is cylindrical, and its axial extension covers the portion of the terminal 200 that protrudes from the first housing 100. The second bend, the third bend, the extension, and the fourth bend are sequentially connected to form the complete corrosion-resistant housing 400. The inner wall of the corrosion-resistant housing 400 has a smooth surface and is pre-filled with a high thermal conductivity material (such as thermally conductive adhesive), further completely covering the portion of the terminal 200 protruding from the first housing 100 and the temperature-sensing element 300.

[0038] In this embodiment, the extension portion and the fourth bend portion respectively cover the portion of the terminal 200 protruding from the first housing 100 and the temperature sensing element 300, which can prevent the terminal 200 and the temperature sensing element 300 from mechanical damage and chemical corrosion, thereby improving the lifespan and reliability of the temperature sensor. Furthermore, the smooth semi-circular structure of the fourth bend portion can avoid stress concentration caused by excessively small angles, further protecting the temperature sensor from damage. Simultaneously, by filling the corrosion-resistant housing 400 with a highly thermally conductive material, mechanical protection and chemical isolation are provided for the temperature sensing element 300 and the terminal 200, preventing damage to the terminal 200 and the temperature sensing element 300 during use. Covering the exposed portion of the terminal 200 can prevent contamination from external moisture, dust, etc., avoiding short circuits and oxidation of the terminal 200, further enhancing the electrical safety of the temperature sensor.

[0039] In one embodiment, a gap exists between the corrosion-resistant housing 400 and the second housing 500. The second housing 500 further includes a mounting portion 502; the mounting portion 502 has threads on its outer side, and the temperature sensor is mounted to an external device via the mounting portion 502. See also... Figure 3 , Figure 3 This is a perspective view of a temperature sensor provided in an embodiment of this application. As can be seen from the figure, one end of this gap abuts against the second sealing ring 402, and the other end abuts against the bottom wall of the mounting portion 502. The width of this gap is not less than 0.2 mm and not greater than 0.5 mm. This gap provides a flow channel for corrosive fluids, wherein... Figure 3The direction indicated by the middle arrow is the direction of entry for the corrosive fluid. During use, the corrosive fluid enters from the bottom of this gap. Due to the second sealing ring 402, the corrosive fluid is sealed at the second sealing ring 402, preventing leakage from this gap. The mounting part 502 has threads on its outer side, which engage with the corresponding internal threads of external devices (such as the expansion valve mounting seat of an automotive air conditioning system) to achieve mechanical fixing and sealing of the temperature sensor.

[0040] In this embodiment, a gap is provided between the corrosion-resistant housing 400 and the second housing 500 to allow the flow of corrosive fluid. This gap extends from the bottom wall of the mounting portion 502 to the bottom wall of the second sealing ring 402, which confines the flow space of the corrosive fluid within this gap, preventing the corrosive fluid from leaking to the outside of the temperature sensor during use and affecting the lifespan and reliability of the temperature sensor. By providing the mounting portion 502 with threads on the outside of the second housing 500, and fixing the temperature sensor by engaging with the internal threads of external devices through these threads, this structure provides a stable mounting base for the temperature sensor, ensuring the long-term reliability of the temperature sensor under high pressure and vibration environments, and facilitating the disassembly and replacement of the temperature sensor.

[0041] In one embodiment, the temperature sensor further includes a third sealing ring 600. The third sealing ring 600 is sleeved on the outer diameter of the mounting portion 502 near the boss 501. The third sealing ring 600 is an O-ring structure, with its inner diameter matching the outer diameter of the mounting portion 502 near the boss 501, and its inner wall tightly adhering to the outer side of the mounting portion 502 near the boss 501. When the temperature sensor is screwed into an external device through the outer thread of the mounting portion 502, as the tightening process proceeds, the boss 501 will eventually contact the surface of the external device. At this time, the third sealing ring 600 is fixed between the outer diameter of the mounting portion 502 near the boss 501 and the inner wall of the mounting hole of the external device, generating a radial sealing force. Simultaneously, due to the limiting effect of the boss 501, the third sealing ring 600 can also be subjected to a certain axial compression, ultimately forming a seal between the temperature sensor and the external device. The material of the third sealing ring 600 is also selected from oil-resistant, heat-resistant, and aging-resistant materials, such as hydrogenated nitrile butadiene rubber (HNBR), or other materials with strong resistance. This application does not limit the material.

[0042] In this embodiment, by setting the third sealing ring 600, a seal is formed between the temperature sensor and the external device, preventing external moisture, dust, and corrosive substances from entering the temperature sensor through the gap between the temperature sensor and the external device and causing damage to the temperature sensor; and the third sealing ring 600 is sleeved on the outer diameter of the mounting part 502, which facilitates disassembly and replacement.

[0043] In one embodiment, the terminal 200 includes a first end 201, a second end 202, and a variable diameter portion 203 connecting the first end 201 and the second end 202; the first end 201 is embedded in the upper end of the first housing 100; the second end 202 extends outward from the first housing 100 and is electrically connected to the temperature sensing element 300; the variable diameter portion 203 includes a third groove 204 near the first end 201 and a fourth groove 205 near the second end 202, and the terminal 200 is fixedly connected to the first housing 100 through the third groove 204 and the fourth groove 205. The first end 201 is located at the top of the terminal 200 and is embedded inside the upper end of the first housing 100; the second end 202 penetrates the first housing 100 along the axial direction of the first housing 100. The diameter of the first end 201 is larger than the diameter of the second end 202, and the two are connected by the variable diameter portion 203. The diameter of the upper surface of the variable diameter portion 203 is the same as the diameter of the first end 201, and its upper surface is in close contact with the lower surface of the first end 201. The diameter of the lower surface of the variable diameter portion 203 is the same as the diameter of the second end 202, and its lower surface is in close contact with the upper surface of the second end 202. The cross-section of the variable diameter portion 203 is conical to distribute stress. A third groove 204 is provided on the side of the variable diameter portion 203 near the first end 201, and a fourth groove 205 is provided on the side of the variable diameter portion 203 near the second end 202. The terminal 200 and the first housing 100 are fixedly connected by the third groove 204 and the fourth groove 205, and the terminal 200 and the first housing 100 are manufactured by an integral molding process.

[0044] In this embodiment, by integrally molding the terminal 200 and the first housing 100, a molecular-level bond can be achieved between the terminal 200 and the first housing 100, forming a perfect seal between them. This avoids the problem of moisture and dust seeping into the temperature sensor due to microscopic gaps when the terminal 200 and the first housing 100 are assembled separately, and also avoids potential internal stress damage to the first housing 100 caused by pressing the terminal 200 into the first housing 100 alone, thus preventing the first housing 100 from cracking. Furthermore, the terminal 200 is encased and fixed by the first housing 100, which can improve the tensile strength and torque resistance of the terminal 200, preventing the terminal 200 from loosening. At the same time, it can also achieve a more stable electrical connection and reduce the risk of poor contact caused by assembly errors.

[0045] In one embodiment, the corrosion-resistant housing 400 is bonded and fixed to the terminal 200 and the temperature sensing element 300 by thermally conductive adhesive. The corrosion-resistant housing 400 is pre-filled with thermally conductive adhesive, and after the terminal 200 and the temperature sensing element 300 are inserted into the corrosion-resistant housing 400, the corrosion-resistant housing 400 completely covers the portion of the terminal 200 protruding from the first housing 100 and the temperature sensing element 300.

[0046] In this embodiment, thermally conductive adhesive is used to bond and fix the corrosion-resistant housing 400 to the terminal 200 and the temperature sensing element 300. This not only improves the vibration resistance of the temperature sensor, but also further improves the sealing performance of the temperature sensor, and further prevents water vapor, dust and other contaminants from entering the interior of the temperature sensor.

[0047] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0048] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A temperature sensor, the temperature sensor comprising: The first housing (100) includes an upper end, a middle end and a lower end, a first groove (101) between the upper end and the middle end, a second groove is provided at the middle end, and a first bend is provided at the lower end; Terminal (200), said terminal (200) is embedded and fixed inside the first housing (100); Temperature sensing element (300), the temperature sensing element (300) is electrically connected to the terminal (200); Its characteristic is that it further includes: A corrosion-resistant housing (400) includes a second bend and a third bend, wherein the shape of the second bend matches the shape of the first bend, one end of which is inserted into the middle end and the other end is connected to the first end of the third bend; The first sealing ring (401) is disposed at the second groove to isolate external moisture; The second sealing ring (402) is disposed on the outside of the third bend to seal against corrosive fluid; The second housing (500) includes an elastic extension and a boss (501). The elastic extension elastically covers the second groove and engages with the first groove (101). The boss (501) and the third bending portion clamp the second sealing ring (402).

2. The temperature sensor according to claim 1, characterized in that, There is a gap between the corrosion-resistant housing (400) and the second housing (500).

3. The temperature sensor according to claim 1, characterized in that, The corrosion-resistant housing (400) also includes an extension and a fourth bend; The fourth bend is connected to the other end of the third bend via the extension, and the fourth bend covers the temperature sensing element (300).

4. The temperature sensor according to claim 1, characterized in that, The second housing (500) further includes: a mounting portion (502); The mounting part (502) has threads on the outside, and the temperature sensor is mounted to an external device through the mounting part (502).

5. The temperature sensor according to claim 4, characterized in that, The temperature sensor also includes: a third sealing ring (600). The third sealing ring (600) is fitted onto the outer diameter of the mounting part (502) on the side near the boss (501).

6. The temperature sensor according to claim 3, characterized in that, The extension covers the portion of the terminal (200) that extends out of the first housing (100).

7. The temperature sensor according to claim 1, characterized in that, The terminal (200) includes a first end (201), a second end (202), and a variable diameter portion (203) connecting the first end (201) and the second end (202). The first end (201) is embedded into the upper end of the first housing (100); The second end (202) extends outward through the first housing (100) and is electrically connected to the temperature sensing element (300); The variable diameter portion (203) includes a third groove (204) near the first end (201) and a fourth groove (205) near the second end (202). The terminal (200) is fixedly connected to the first housing (100) through the third groove (204) and the fourth groove (205).

8. The temperature sensor according to claim 1, characterized in that, The corrosion-resistant housing (400) is bonded and fixed to the terminal (200) and the temperature sensing element (300) by thermally conductive adhesive.

9. The temperature sensor according to claim 1, characterized in that, The first housing (100) is a plastic housing.

10. The temperature sensor according to claim 1, characterized in that, The second housing (500) is a metal housing.

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